<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link
      href="../../../dependence/bootstrap/v4/bootstrap.min.css"
      rel="stylesheet"
    />
    <title>Demo1</title>
    <style>
      .row {
        height: 100vh;
        text-align: center;
        align-items: center;
      }
    </style>
  </head>

  <body>
    <div class="container-fluid">
      <div class="row">
        <div class="col-sm box">
          <div class="form-group" style="width: 30%">
            <label for=""></label>
            <select class="form-control" name="" id="">
              <option>1</option>
              <option>2</option>
              <option>3</option>
            </select>
          </div>
        </div>
        <div class="col-sm box">One of three columns</div>
        <div class="col-sm box">One of three columns</div>
      </div>
    </div>
  </body>
</html>
